http://www.hkepc.com/hwdb/r520firstlook-e.htm
"As the card maker doesn't wish to reveal the R520 performance yet, but we can confirm that R520 at 24pp or 32pp will not be lower than that of the GeForce 7800GTX. Even though the 32pp and 24pp R520 mass production will face some difficulties, but the 16 pipelines R520 using the 90nm core will be clocked high to maintain a certain level of competitiveness."
"As the card maker doesn't wish to reveal the R520 performance yet, but we can confirm that R520 at 24pp or 32pp will not be lower than that of the GeForce 7800GTX. Even though the 32pp and 24pp R520 mass production will face some difficulties, but the 16 pipelines R520 using the 90nm core will be clocked high to maintain a certain level of competitiveness."